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Future Policy Benefits and Claims - Claims Development Tables (Details) $ in Millions | Dec. 31, 2024 USD ($) claim | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
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Claims Development |  |  |  |  |  |  |  |  |  |
Total outstanding liabilities for unpaid claims net of reinsurance | $ 1,399.5 |  |  |  |  |  |  |  |  |
Long-Term Disability/Group Life Waiver |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 2,329.7 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | 1,343.1 |  |  |  |  |  |  |  |  |
Liability for unpaid claims net, not separately presented | 249.3 |  |  |  |  |  |  |  |  |
Total outstanding liabilities for unpaid claims net of reinsurance | 1,235.9 |  |  |  |  |  |  |  |  |
Long-Term Disability/Group Life Waiver | Incurral year 2015 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 208.5 | $ 208.3 | $ 210.5 | $ 211.8 | $ 210.0 | $ 208.2 | $ 215.3 | $ 217.2 | $ 227.2 | $ 231.0
Incurred but not reported claims | $ 0.1 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 7,184 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 166.5 | 160.3 | 154.0 | 146.5 | 137.1 | 126.8 | 114.6 | 98.0 | 67.0 | $ 16.9
Long-Term Disability/Group Life Waiver | Incurral year 2016 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 218.0 | 219.0 | 221.9 | 218.7 | 214.4 | 219.5 | 219.4 | 228.4 | 229.8 |
Incurred but not reported claims | $ 0.1 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 6,172 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 171.5 | 165.3 | 157.1 | 147.2 | 136.8 | 124.9 | 105.6 | 70.6 | $ 16.2 |
Long-Term Disability/Group Life Waiver | Incurral year 2017 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 248.7 | 248.9 | 246.5 | 245.2 | 245.8 | 243.1 | 239.7 | 238.4 |  |
Incurred but not reported claims | $ 0.1 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 6,092 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 185.6 | 176.8 | 165.4 | 151.7 | 135.9 | 115.0 | 76.5 | $ 17.8 |  |
Long-Term Disability/Group Life Waiver | Incurral year 2018 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 241.9 | 238.0 | 235.3 | 239.8 | 239.2 | 245.1 | 239.4 |  |  |
Incurred but not reported claims | $ 0.1 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 5,784 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 173.3 | 163.3 | 150.3 | 135.7 | 115.7 | 79.9 | $ 20.1 |  |  |
Long-Term Disability/Group Life Waiver | Incurral year 2019 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 243.4 | 238.6 | 240.2 | 240.4 | 248.4 | 255.2 |  |  |  |
Incurred but not reported claims | $ 0.1 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 5,962 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 163.6 | 150.6 | 136.4 | 117.5 | 79.7 | $ 19.2 |  |  |  |
Long-Term Disability/Group Life Waiver | Incurral year 2020 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 211.3 | 217.7 | 221.1 | 231.0 | 252.1 |  |  |  |  |
Incurred but not reported claims | $ 0.1 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 5,942 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 140.8 | 130.0 | 113.1 | 78.8 | $ 20.6 |  |  |  |  |
Long-Term Disability/Group Life Waiver | Incurral year 2021 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 221.2 | 221.6 | 244.5 | 259.7 |  |  |  |  |  |
Incurred but not reported claims | $ 6.2 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 5,586 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 128.6 | 113.2 | 79.0 | $ 19.8 |  |  |  |  |  |
Long-Term Disability/Group Life Waiver | Incurral year 2022 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 227.6 | 240.5 | 274.3 |  |  |  |  |  |  |
Incurred but not reported claims | $ 8.5 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 5,646 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 111.4 | 76.6 | $ 19.6 |  |  |  |  |  |  |
Long-Term Disability/Group Life Waiver | Incurral year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 245.2 | 267.4 |  |  |  |  |  |  |  |
Incurred but not reported claims | $ 15.2 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 5,354 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 77.3 | 20.0 |  |  |  |  |  |  |  |
Long-Term Disability/Group Life Waiver | Incurral year 2024 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 263.9 |  |  |  |  |  |  |  |  |
Incurred but not reported claims | $ 96.7 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 2,953 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 24.5 |  |  |  |  |  |  |  |  |
Dental, Vision, STD, Critical Illness, Accident, Hospital Indemnity and PFML |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 2,151.4 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | 2,061.2 |  |  |  |  |  |  |  |  |
Total outstanding liabilities for unpaid claims net of reinsurance | 90.2 |  |  |  |  |  |  |  |  |
Dental, Vision, STD, Critical Illness, Accident, Hospital Indemnity and PFML | Incurral year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | $ 1,022.1 | 1,032.3 |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 4,774,225 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 1,021.3 | 954.0 |  |  |  |  |  |  |  |
Dental, Vision, STD, Critical Illness, Accident, Hospital Indemnity and PFML | Incurral year 2024 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 1,129.3 |  |  |  |  |  |  |  |  |
Incurred but not reported claims | $ 66.9 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 4,787,967 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 1,039.9 |  |  |  |  |  |  |  |  |
Group Life |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 568.2 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | 500.9 |  |  |  |  |  |  |  |  |
Liability for unpaid claims net, not separately presented | 6.1 |  |  |  |  |  |  |  |  |
Total outstanding liabilities for unpaid claims net of reinsurance | 73.4 |  |  |  |  |  |  |  |  |
Group Life | Incurral year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 283.1 | 284.8 |  |  |  |  |  |  |  |
Incurred but not reported claims | $ 0.9 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 5,814 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 277.2 | $ 215.1 |  |  |  |  |  |  |  |
Group Life | Incurral year 2024 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 285.1 |  |  |  |  |  |  |  |  |
Incurred but not reported claims | $ 29.6 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 5,265 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 223.7 |  |  |  |  |  |  |  |  |

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